TRANSPORTATION ENERGY USE

TRANSPORTATION ENERGY USE

Transportation accounts for about 28 percent of U.S. energy consumption. Petroleum
accounts for nearly all (about 97 percent) of the transportation sector's energy
use. Petroleum is a major component of transportation costs, and its usage affects
the environment. Because more than half of the U.S. petroleum supply is imported,
there are also national security concerns for assuring petroleum supplies.

Transportation Energy Consumption

Jul-01

Jul-02

Quadrillion BTU

2.44

2.39

Percent change from same month previous year

3.79

-2.13

NOTE: The current value is compared to the value from
the same period in the previous year to account for seasonality.

One quadrillion is equal to one billion million.

A trendline has been provided for transportation energy consumption. The trend
has been calculated through a statistical procedure called Structural Modeling,
in which the time series under study is decomposed into seasonal, trend and irregular
components. For further information on this statistical procedure, see: S.J. Koopman,
et al., Structural Time Series Analyser, Modeller And Predictor (STAMP),
London: Timberlake Consultants Ltd., 2000.